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authorFilip Gawin <filip.gawin@zoho.com>2020-03-27 21:50:52 +0100
committerFilip Gawin <filip.gawin@zoho.com>2020-03-28 19:46:09 +0100
commitb235c358341b288f34cee5936a376f71d0cfbf9a (patch)
tree8e4e605bcdecafe171defbc2099b8ce06c519686 /src/core/patcher.cpp
parentRemove assembly from patcher.h (diff)
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Diffstat (limited to 'src/core/patcher.cpp')
-rw-r--r--src/core/patcher.cpp57
1 files changed, 57 insertions, 0 deletions
diff --git a/src/core/patcher.cpp b/src/core/patcher.cpp
index 5fdbdf8b..19ca5f07 100644
--- a/src/core/patcher.cpp
+++ b/src/core/patcher.cpp
@@ -1,6 +1,11 @@
#include "common.h"
#include "patcher.h"
+#include <algorithm>
+#include <vector>
+
+#include <Windows.h>
+
StaticPatcher *StaticPatcher::ms_head;
StaticPatcher::StaticPatcher(Patcher func)
@@ -20,3 +25,55 @@ StaticPatcher::Apply()
}
ms_head = nil;
}
+
+std::vector<uint32> usedAddresses;
+
+static DWORD protect[2];
+static uint32 protect_address;
+static uint32 protect_size;
+
+void
+Protect_internal(uint32 address, uint32 size)
+{
+ protect_address = address;
+ protect_size = size;
+ VirtualProtect((void*)address, size, PAGE_EXECUTE_READWRITE, &protect[0]);
+}
+
+void
+Unprotect_internal(void)
+{
+ VirtualProtect((void*)protect_address, protect_size, protect[0], &protect[1]);
+}
+
+void
+InjectHook_internal(uint32 address, uint32 hook, int type)
+{
+ if(std::any_of(usedAddresses.begin(), usedAddresses.end(),
+ [address](uint32 value) { return value == address; })) {
+ debug("Used address %#06x twice when injecting hook\n", address);
+ }
+
+ usedAddresses.push_back(address);
+
+
+ switch(type){
+ case PATCH_JUMP:
+ VirtualProtect((void*)address, 5, PAGE_EXECUTE_READWRITE, &protect[0]);
+ *(uint8*)address = 0xE9;
+ break;
+ case PATCH_CALL:
+ VirtualProtect((void*)address, 5, PAGE_EXECUTE_READWRITE, &protect[0]);
+ *(uint8*)address = 0xE8;
+ break;
+ default:
+ VirtualProtect((void*)(address + 1), 4, PAGE_EXECUTE_READWRITE, &protect[0]);
+ break;
+ }
+
+ *(ptrdiff_t*)(address + 1) = hook - address - 5;
+ if(type == PATCH_NOTHING)
+ VirtualProtect((void*)(address + 1), 4, protect[0], &protect[1]);
+ else
+ VirtualProtect((void*)address, 5, protect[0], &protect[1]);
+} \ No newline at end of file